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Re: Autovacuum and invalid page header

From: Ireneusz Pluta <ipluta(at)wp(dot)pl>
To: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, "pgsql-admin(at)postgresql(dot)org" <pgsql-admin(at)postgresql(dot)org>
Subject: Re: Autovacuum and invalid page header
Date: 2010-09-03 08:42:54
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Lists: pgsql-admin
Kevin Grittner pisze:
> Ireneusz Pluta <ipluta(at)wp(dot)pl> wrote:
>> Is there
>> any ready tool, which, for instance when given a path to database
>> cluster, would traverse all cluster directories and files and
>> check all page headers? I probably answered myself - manual VACUUM
>> [VERBOSE] would do - but it fails when finds the first invalid
>> header, so I would have. That's why I am looking for something
>> only scanning and reporting invalid headers.
> I don't know of anything, but you might try searching pgfoundry.
Continuing revisiting my old thread, and to answer myself:
find and pg_filedump seem to be the way, more-less like:
find $PGDATA -type f -name [0-9]* |   while read f; do echo $f && 
pg_filedump $f | grep -i invalid; done
# not tested yet
- of course keeping in mind that newly allocated pages might appear 
invalid to pg_filedump, while the server is running, as Tom explained 
just recently:
> A newly-added page on disk will
> be initially filled with zeroes, which I think pg_filedump will complain
> about.  It won't get overwritten with "valid" data until the page is
> next written, either because of a checkpoint or because the buffer space
> is needed for another page.  pg_filedump can't see the state of the page
> within the server's buffers, which is what counts here.

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